Risks to these systems are large even with a small increase in temperature. 3. Social- Sectors affected by Global warming include food security, water resources and human health. Impacts will be uneven within and across different countries. Climate change increases the risk of many negative impacts such as reduced crop productivity and urban flooding in coastal
While orbital forcing is the primary external driver of glacial cycles, carbon dioxide content in the atmosphere plays this important internal feedback role (Pittock, 2005). Evidence for environmental change in the Pleistocene epoch include constituents of gas bubbles trapped in ice cores. According to BAS Natural Environment Research Council (2015), Ice cores are cylinders of ice drilled out of an ice sheet or glacier, with most of them coming from Antarctica and Greenland. Looking at ice cores can provide direct information about past climate change, going back as far as at least 800,000 years. They also provide evidence that under some circumstances climate can change abruptly.
(Singh, 1999) In South Asia, major amount of irrigation water for summer crops comes from the snow melting in the Himalayas. Major rivers in Pakistan i.e. Indus originate from Himalayas. In the winter season more than 600,000 km2 area in Himalayas is covered with snow which also contains the land covered in permanent
Climate change refers to a change in an average weather conditions, or in the time variation of weather around longer term average conditions (for an average 30 years). According to the definition of World Meteorological Organization (WMO), Climate is the measurement of the mean and variability of relevant quantities of certain variables (such as temperature, precipitation or wind) over a period of time, ranging from months to thousands or millions of years. Climate change itself is a natural process; however, the global temperature is rising rapidly due to an anthropogenic activity which is changing the climate of the earth faster than it would change naturally. Scientists from all over the world have independently verified this evidence many times. Average temperatures around the world have risen by 0.75°C (1.4°F) and over the last 100 years about two thirds of this increase has occurred since 1975.
INTRODUCTION The world’s climate is changing and it will continue to change throughout the 21st century and beyond. Rising temperatures, variable precipitation patterns, rising water levels due to melting icebergs and many other such changes are already affecting many aspects of the human society and the natural world. Climate change is transforming ecosystems at extra ordinary rates and scales. It is a global change process but with diverse regional manifestations. Mankind has abused nature for far too long and would pay a heavy price unless urgent remedial measures are undertaken.
INTRODUCTION Coast line is one of the components, are recognized as unique features on the earth (Li et al., 2003). The coast line can be defined as the line of contact between land and a body of water (Alesheikh et al., 2004). Coastal line changes are mainly due to human factors and natural factors such as waves, tides, winds, periodic storms and sea-level change. Natural factors are a result of global warming. Many scientists consider global warming force climatic change as the most serious environmental threat facing the world today.
The maximum snow cover is in March or April — about 20 to 50 cm (7.9 to 19.7 in). The climate of the Arctic region has varied significantly in the past. As recently as 55 million years ago, during the eocene epoch, the region reached an average annual temperature of 10–20 °C (50–68 °F). The surface waters of the Arctic ocean warmed enough to support tropical lifeforms. Animal and plant life[change | change
We can see that some of the main cause of this is due to mass input and ocean warming. It is also mainly associated with the ice age. It is clear that the end of the ice age has caused polar caps and ice sheets to melt resulting in the rise of sea level all over the world. We are also aware that due to human influences global warming plays a huge part too. When looking at global sea level rise we are introduced to global records.
TOPIC 5: CLIMATE CHANGE AND WEATHER CONSEQUENCES OF CLIMATE CHANGE ON ENSO AND MJO The consequences of climate change on weather elements of evaporation/ water vapour. Water vapour is also known as one type of major gas that contain in greenhouse gases. The existence of this gas can contribute to global warming. This water vapour absorb the long wave radiation which also known as sun radiation and radiates back to the atmosphere and causing global warming. The increasing of water vapour in the atmosphere leads to higher air temperature which then causes more water vapour to be absorbed into the air.
Many scientists believe that our production of carbon dioxide and other greenhouse gases is having a heat effect on the atmosphere and this could be dangerous for the environment and human life (Hansen, 2011). This article will examine the causes of global warming, its impacts and the remedies we can do to combat global warming. Many problems could result from global warming. Increase in average temperatures could lead to ice melting in both polar ice caps and mountain glaciers. Global warming also bring extreme weather events, causes sea level to rise, increases ocean acidification and causes lakes and oceans to warm rapidly than surrounding environment.